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本人是初学者，买了个开发板，有关于ATA访问的函数，以下是头文件，向高手请教基本读写IDE硬盘方法。
/*ATA register*/
#define DM642_ATA_AS     (DM642_ATACS1 + 0x18) //read only
#define DM642_ATA_DEVCON    (DM642_ATACS1 + 0x18) //write only

#define DM642_ATA_DATA   (DM642_ATACS0 + 0x0) //write and read
#define DM642_ATA_ERROR     (DM642_ATACS0 + 0x4) //read  only
#define DM642_ATA_FEATURES  (DM642_ATACS0 + 0x4) //write only
#define DM642_ATA_SECTOR    (DM642_ATACS0 + 0x8) //write and read
#define DM642_ATA_LBAL      (DM642_ATACS0 + 0xc)//write and read
#define DM642_ATA_LBAM      (DM642_ATACS0 + 0x10) //write and read
#define DM642_ATA_LBAH      (DM642_ATACS0 + 0x14)//write and read
#define DM642_ATA_DEVICE (DM642_ATACS0 + 0x18) //write and read
#define DM642_ATA_COM    (DM642_ATACS0 + 0x1c) //write only
#define DM642_ATA_STATUS    (DM642_ATACS0 + 0x1c) //read only

/*the bus status*/
#define ATA_BUS_BSY  0x80
#define ATA_BUS_DRDY 0x40
#define ATA_BUS_DF   0x20
#define ATA_BUS_DRQ  0x08
#define ATA_BUS_ERR  0x01

/*ata command*/
#define IDENTIFY_DEVICE      0xEC
#define READ_SECTOR(S)       0x20
#define WRITE_SECTOR(S)      0x30
/*ATA command,if a regiset is not used during command ,set the rigiter
value :0x100*/
typedef struct {
 Uint32 features;        
 Uint32 sector_count;    
 Uint32 LBA_l;          
 Uint32 LBA_M;        
 Uint32 LBA_H;            
 Uint32 device;        
 Uint32 com_code;
 int    prereq;
 int    complete_flag;
} ATA_command;
/* ATA Handle */
typedef int DM642_ATAHandle;

/*******************************************************************/
/*                   */
/* int ata_status()              */
/*  描述：读回当前硬盘的状态           */
/*  参数：无               */
/*  返值：当前状态寄存器的值           */
/*                   */
/*******************************************************************/
int ata_status();
/*******************************************************************/
/*                   */
/* DM642_ATAHandle ata_open()            */
/*  描述：打开有效的硬盘设备           */
/*  参数：无               */
/*  返值：有效设备的句柄            */
/*                   */
/*******************************************************************/
DM642_ATAHandle ata_open();
/*******************************************************************/
/*                   */
/* int ata_command()              */
/*  描述：设置当前寄存器               */
/*  参数：regaddr:寄存器地址           */
/*     regdata:寄存器的值                                   */
/*  返值：无               */
/*                   */
/*******************************************************************/
Bool ata_command(ATA_command *command,Uint32 buffer,Uint32 longth);
/*******************************************************************/
/*                   */
/* int ata_reg_write()              */
/*  描述：设置当前寄存器               */
/*  参数：regaddr:寄存器地址           */
/*     regdata:寄存器的值                                   */
/*  返值：无               */
/*                   */
/*******************************************************************/
void ata_reg_write(Uint32 regaddr,Uint32 regdata);
/*******************************************************************/
/*                   */
/* int ata_reg_read()              */
/*  描述：读回当前寄存器的状态           */
/*  参数：寄存器指示             */
/*  返值：当前状态寄存器的值           */
/*                   */
/*******************************************************************/
int ata_reg_read(Uint32 regaddr);